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STMPE16M31 Datasheet(PDF) 51 Page - STMicroelectronics |
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STMPE16M31 Datasheet(HTML) 51 Page - STMicroelectronics |
51 / 85 page STMPE16M31, STMPE24M31 Touch sensor controller Doc ID 16174 Rev 4 51/85 13.4 Locked impedance Locked impedance is data available in channel data the moment 0x06 is written into “channel data type register”. Writing a different value into the “channel data type register” allows the locked impedance to be refreshed. In actual application, software writes 0x06, reads locked impedance, writes 0x00, writes 0x06, and reads the next set of data. For data type 0x04-0x05, data are constantly being refreshed, even as it is being accessed. If accessed slowly, the full set of data may have been sampled at significantly different time. 13.5 Calibration Calibration event is performed in every period which is programmable from the calibration interval register (0x76). In each calibration event, 8 impedance samples are collected and averaged. The time period between samples is programmable from CAL_MOD (model register (0x77). Figure 16. Calibration Obsolete Product(s) - Obsolete Product(s) |
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